The Japanese carrier force launched its Pearl Harbor aircraft from approximately 230 miles north of Oahu. That distance helped the attackers preserve surprise while keeping the carriers beyond the immediate reach of defenders.
The striking force reached its launch position in the North Pacific after sailing under strict radio silence. Aircraft took off before dawn and flew south toward Oahu, where the first wave arrived shortly before 8 a.m.
The operation required careful navigation, weather planning, and coordination among six carriers. It also depended on the aircraft having sufficient range to attack and return to the ships.
The Japanese fleet’s approach was not detected by American surface patrols before the raid. The attack’s success therefore reflected both operational secrecy and the limitations of the warning systems available in Hawaii in 1941.